Cutting cusp for dentures



y 1945- GA. WIEYCHERT I 2,375,509

CUTTING CUSP FOR DENTURES Filed Oct. 23, 1945 INVENTOR GeozyeA. M'ecken? BY Patented May 8 1945 UNITED STATES OFFICE 1 f 2,375,509, M M" e I ou'r'rrno c sP FOR mvrmms George A. Wiechert, New YOlfkpN. asslgnorof thirty-three and'one-thirdpencent to Emerson P. Jennings, New York, NY. Application October 23, 1943, Serial No. 507,371

I 8 Claims This invention relates to new and useful improvements in cutting cusps for dentures. This application relates to the subject matter of my abandoned application filed on April 26, 1940, Serial Number 331,751. 1 e

. More specifically, the invention. contemplates the construction of an artificial posterior lower or upper denture tooth having. aismoo th convexly curved mesio-distally extending occlusal face. for

engaging a complementary concaved curved oc- "extending occlusal face with-several transverse channels or sluices extending from the. 'buccal and lingual sides to and, joining saidmesio-distally extending channels orsluices.

An artificial tooth so constructed truly reprefood with equal effectiveness at an approximate 50% reduction of applied forces, thereby preserving the underlying tissue structure.

The invention contemplates arranging the artificial posterior lower or upper denture teeth'in groups, preferablyof' two, three or f our, and mounting these groups in the denture. It is 'contemplated that these teeth be case hardened metal or other metal or materials so thatthey retain their keen efficiency: perpetually 'I The I .1 lo

cusps, and particularly designed to'make mastication a pleasure tolong-suffering denture wearers. I

For further comprehension of'f'the invention and of the'objects and advantages thereof, ref-g erence will be hadto the following description and accompanying drawing, and to the .append ed claims in which the various novel features of. the'invention are more particularly setforth. I

In the accompanying drawing forming a materi-al'part of this disclosure- Fig. l is 'anelevational view of a denture pro 'yided with posterior teeth constructed in accordance with this invention.

Fig. 2 isa vertical sectional enlarged detailed 7 view taken on the line '2--2 of Fig. l,' illustrated I I incom'b'inaticn with a schematic-showing of an opposed denture.

Fig; 3 is a perspective viewof one side group of the' a-rtiflcial posterior dentureteethshown in I i I Fig. 1.

sentsa triple'duty cutting cuspwith anatomical proportions designed to cut at will all types of teeth may be formed of cobalt, chromium, alloyed metal or other similar materials of ,extremehardness which are non-ferrous, non-corrosive, nonmagnetic and stainless, whichcan be polished to 'a high luster and which maintain that luster and' are not affected in any way by the acids or secretions of the mouth. It is further proposed that thecuter surfaces, including the channels or sluices, be highly glazed to insure self elimination of masticated food. "The group of artificial teeth in the denture may include. any, desired number of teeth. 1 I

The invention contemplates shaping thecutting cusps to include all types of artificialposteriors, and it is proposed that these be applicable to old dentures as well as new ones; y

The cutting cusps, in accordance with 'thisin- Fig. 4 is a'bottomelevational view of the group of teeth shown in Fig. 3. e I a Fig. Sis a sectional view similar to Fig. Z but illustrating a modification of the invention.

This invention particularly relates to a group of artificial posterior denture teeth I consisting ti'ca'l group applies to both sides of the I mouth.

The front artificial teeth II are of conventional construction. The group of teeth I0 preferably is cast of one integral piece of non-rusting metal,

asshown inFigs. 3 and 4. However, the invention is] not limited to metallic teeth and mayapcaved curved occlusal face I3ofthe tooth Ill in the opposed denture T5." The face 12 is formed with a pair of m'esio-distally extending channels;

or sluices, l6 and I1 with the central wall or ridge 18 between the channels or sluicescomprising a blade having a flat side I8" and an opposite conv vexly curved side I8 forming a chisel-sharp edge along the common portions of the sides I and The said convexly curved mesio-distally extending occlusal face I2 has several bucco-lingually extending channels or sluices I9 extending fromfthelbuccal and lingual sides to'andjoining the mesio-distally extending "charm'els or the group Ill hasafsmooth convexly curved mesio-distally extending -occlusal face I2 for engaging a complementary conprise fiat milling surfaces for assist the chisel sharp edge of the blade l8 sluices l6 and I1. The purpose of these buccolingually extending channels or sluices l9 is to cutdown thearea of the occlusal face I2 so asjto I increase the pressure of the bite of the tooth on the smaller area. These areas essentially comgrinding of food particles.

The occlusalface I2 intersects the buccal face 20 and the lingual face 2| in sharp edges 22 which in the proper mastication of the food.

In the form of the invention illustrated in Figs. 1-4 incl'usiveithe group of teeth I is formed from curved mesio-distally extending occlusal face having several bucco-lingually extending chan-,

nels-or. sluices extending from the buccal and lingual sides; to and joining with said mesio the milling and I one integral'cast which has a hollow bottom side 23. The outer side of this cast is very-smoothly finished and polished to.formhighly glazed sur-' faces. The. group of teeth I0 is mounted in the denture 25 in the usual way.

In Fig. 5 a modified form'of the inventionhas been disclosed which is very similar'to the prior form, distinguishing merely in the fact that the blade I8 has its .straight fiat side I8? on the buccal side 20 and has its curved convexly shaped vious form and like parts may reference numerals l During mastic'ation the chisel sharp edges of side l8 on its lingual side 2|. In otherrespects this form of the invention is similar to the prebe identifiedbylike the blades l8 and-the sharp edges 22 will cut fibrous, food, breakingdown the fibers. f The flat faces between the channels or sluices of the teeth will act as milling surfacesfor milling thefood the cusps. An artificial posterior tooth constructed in accordance withthis'invention is particularly adapted to efficientlymasticate food.

While Ihaveillustrated and described the preferred embodiments of my invention, it; is to be' understood that I do not limit myself to the precise constructions herein disclosed and the right is reserved to all changes and modifications coming within the scope of the invention as de-' fined in the appended claims. i i

.Having thusdescribed my'invention, whatI claim as new, and desire to" secure by United States Letters Patent is: 1

1. An artificial posterior denture tooth having asmooth convexly curved mesio-distally extend ing occlusal face for engaging a complementary concaved curved occlusal face of the tooth in the opposed denture and formed with a pair of mesh)- distally, extending vchannels or sluices with the comprising a blade having a straight flat side .and an opposite convexly curved side forming a chisel sharp edge, said convexly curved mesiodistally extending occlusal. face having several buccoelingually extending channels or sluices extending from the buccal and lingual sides to and joiningwith 'said mesiodistally extending channels or sluices.

An artificial posterior denture tooth having a smoothv convexly curved mesio-distally extending occlusal face for engaging a complementary concaved curved occlusal face of, the :tooth in the opposed denture and formed with a distally extending channels .or sluices, said chisel sharp edge being on' the buccal side of the blade. 3. An artificial posterior denture tooth having a smooth convexly curved mesio-distally extending occlusal facefor engaging a complementary concaved curved occlusal face of the tooth in the opposed denture and formed with a pair of mesio distally extending channels or sluices with the Y central wall between said channels or sluices comprising a blade having a straight fiat side and an opposite convexly curved side forming a chisel sharpedge, said convexly curved mesiow distally extending occlusal'face having several bucco linguallyextending channels or sluices extending'from the buccal and lingual sides to and joining with said mesio-distally extending chan- I nels or sluices, saidchisel sharpv edge being on the buccal-side of the blade, the areas of said occlusal face between said channels or sluices comprising fiat milling surfaces. l v 4. An artificial posterior denture lower tooth of .hard stainless alloy and having a smooth-convexly, curved mesio-distally*extending, occlusal surface for engaging an occlusal face of atooth in an "opposed denture and formed with a pair of mesio-distally extending channels having rounded bottoms with the central wall "between said channels comprising a blade having a straightflat side, meeting said face substantially.

at right angles, said convexly. curved mesio-dis tally-extending occlusal. face having several bucco-lingually extending channels or sluices extending from the buccal and lingual sidesto and joining with said mesio-distally extending channelsat the bottom thereof and remote from the blade, the areas ofsaid' occlusal face between I said channels comprising substantially milling surfaces, the channel bottoms being rounded so that particles of food forced down beside one wall.

will be reversed in direction and be pushed up the opposite side wall to a differentmilling surface.

5. An artificial hard metallic posterior denture tooth. containing chromium and .having a smooth convexly curved mesiodistally extend ing occlusal face for engaging an occlusalqface of. a tooth in an opposed denture and' formed with a pair of mesio-distally extending channels with thecentral wall between said channels I central-wall'between said channels or sluices.

pair of mesio-distally l extending channelsor I sluices with the central wall between said channels: or sluices comprising a blade having a straight fiat side and an-opposite convexly curved si e f rm n a ph e h nfe e' id q n v comprising a blade having a straight flat side forming a sharp edge, said convexly curved mesio-distally extending occlusal face-having a .bucco-lingually extending sluice extending from the buccal and lingualisides to andjoining with said mesio-distally extending channels remote.

from said blade. I

6. An artificial hard;metallic posterior den-1 ,ture zt ooth containing chromium and havinga smooth convexly curved mesio-distally extending occlusal face forengagingan occlusalfaceof a toothin an opposed denture and formed with a pair of mesio-distally extending channels with the central wall between said channels comprising a blade having a straight fiat side forminga sharp edge, said convexly curved mesio-distally extending-occlusal face having a bucco-lingually extending sluice extending from the buccal and lingual sides to and joining with said mesio distally extending channels remote from said v blade, the" areas of said occlusal face between said channels or sluices comprising fiat milling surfaces. v

'7. A non-corrosive artificial posterior denture tooth containing cobalt and chromium having a smooth convexly curved mesio-distally extending occlusal face for engaging an occlusal face of the tooth in the opposed denture and formed with a pair of me sio-distally extending channels or sluices,with the central wall between the channels comprising a blade having straight flat sides forming chiselsharp edges, said convexly curved mesio-distally extending occlusal face having a bucco-lingually extending channel or sluice extending from the buccal and lingual sides to and joining with said 5 mesiodistally extending channels or sluices, said chisel sharp edge being on the buccal side of the blade. l5

8. An artificial posterior denture tooth having a smooth convexly curved mesio-distally extending occlusal face for engaging an occlusal face of a tooth in an opposed denture and formed with a pair of mesio-distally extending channels with the central wall between said channels comprising a blade having a'straight flat side forming a sharp edge; said convexly curved mesiodistally extending occlusal face having a buccolingually extending sluice extending from the buccal and lingual sides to and joining with said mesio-distally extending channels remote from said blade. a

GEORGE A. W'IECHERT. 

